15) Function notation:
f(x) = x² - 5x +8
16) f(2) , means you have to replace x by 2
f(2) = 2² - 5(2) + 8 = 4-10+8 and f(2) = 2
17) f(x) = 8 , means : 8 = x² - 5x +8
Simplify x² - 5x = 0
Factorize x² - 5x = 0 → x(x - 5) = 0, then the valueS of x are:
x = 0 and x = 5
Answer:
0.020
Step-by-step explanation:
Given that,
μ = 17,
σ = 0.7,
x¯ = 16.7 hours
n(number of batteries) = 30
To find,
The probability(e) by using μ\frac{σ}{} = normal cdf
∵ (E - 99, 16.7 , 17, 0.8/)
The probability of getting a random sample of 30 batteries = 0.020
Hence, the claim is reasonable as only 2% of batteries are likely to last till 16.7 hours.
Complete question :
Taylor earns $5 each time she walks her neighbor's dog. She has already earned $25. Write and solve an equation to find out how many more times Taylor needs to walk the dog to earn enough to buy a bike that costs $83.
Answer:
12
Step-by-step explanation:
Amount earned for walking dog = $5 per walk
Amount already earned = $25
How many more times dog needs to be walked to buy a bike which costs $83
Target amount = 83
(Target amount - already earned amount) / amount earned per Walk
(83 - 25) / 5
58 / 5
= 11.6
Hence, Taylor needs to walk her neighbor's dog 12 more times